Prove that the equation 2x2+xy-6y2+7y-2=0 represents a pair of straight lines

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
Chapter10: Analytic Geometry
Section10.4: Analytic Proofs
Problem 23E: Use the result in Exercise 20 to find the equation of the line that contains 5,-1 and is parallel to...
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Prove that the equation 2x2+xy-6y2+7y-2=0 represents a pair of straight lines 

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